Brake-shoe and method of making same.



No. 838,316. PATENTED DEC. 11, 1906.

H. K. GILBERT. BRAKE SHOE AND METHOD OF MAKING SAME.

APPLICATION FILED DBO. 19,1905.

UNITED STATES PATENT oEEIoE.

HENRY K. GILBERT, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN BRAKE SHOE & FOUNDRY COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Applicationfiled December 19, 1905. Serial No: 292.420.

1'0 all whom it may concern:

Be it known that I, HENRY K. GILBERT, a citizen of the United States, residing at Chicago, in the State of Illinois, have invented a certain new and useful Improvement in Brake-Shoes and the Methods of Making the Same, of which the following is a specification.

The invention relates to brake shoes of the type having a cast body portion and a back portion of malleable metal. The objects of the invention are; to provide an improved back for brake shoes of the'above type which shall be of greater strength than those heretofore provided and havin a better attaching surface for the cast meta body portion, and further, to provide an improve method of making the shoes and their back portions whereby the steps in making are few, the necessary machinery simple and the cost of production small. The article and thesteps of making the same are illustrated in the accompanying drawings, in which- Figure 1 is a erspective view of the tube from which the iiack or blank is to be made;

Figure 2 is a pers ective showing the slots cut in the ends of t e tube, which operation constitutes the first step in the process;

Figure 3 is a perspective showing in full lines the blank after the end portions of the tube have been flattened down leaving them somewhat corrugated, and in the dotted lines the outline of. the body portion which is to be cast embracing the back portion or blank;

Figure 4 is a pers ective showing one end of a modified form 0 my blank, and

Figure 5 is a perspective illustrating another form of blank.

Figure 1 shows the tube from which the back plate of the shoe is to be made and cornprises a section from a square commercial tube. The first step in the process is the cutting of the slots 7, 7, at a suificient distance apart to form the key-Way lug 8. These lugs are cut so as to sever all of the tube except the bottom section or side 9. The next step is the cutting out of the top portions 10 on either side of the lug 8. This slot may be of greater or less width depending upon the desired width of the flat portion after the blank is completed. The next step is the opening out of the side pieces 11 which leaves them in the corrugated shape shown in Figure The plate may also be curved longitudinally at the same time that it is being flattened. The completed back plate is shown in full lines in Figure 3, while the cast portion is indicated by the dotted lines. It will be observed that the cast portion extends above and below the flat portions of the back plate, and also up and over the lug 8, thereby reinforcing and strengthenin such lug 8 and more effectually joining t e back and body portions of the shoe. Figure 4 illustrates one of the modifications to which the invention is subject. In thismodification the central portion of the flat part is cut out to provide a' etter attaching surface for the cast metal. Figure 5 discloses another modification on the same order, the flat piece having been divided and spread apart. These divided ortions 12 may be made to pass through the body portion of the shoe at any desired angle. It will be understood that the invention is not confined to use with square tubes, although this is my referred formof blank. Round tubes or tu es of various other shapes might be used without departing from the invention. It is also apparent that the width of the slot 10 might be varied, and in fact a cut of only the width of the cutting tool might be made instead of cutting out a section as illustrated. The corrugating of the fiat portion of the back late serves not only to stiffen the plate, but a so provides a better attachin surface for the cast metal. The rovision o? the cast metal over and around t e lug S constitutes an important feature of my invention and gives a key-way lug of great strength. It will also be seen that the number of steps involved in the production of the back plate are few and that the labor incident to the production of the blank from commercial stock is a minimum.

Having thus described my invention and illustrated its use, what I claim as new, and desire to secure by Letters Patent, is the following:

1. The process of making brake shoe blanks which consists in making two cross slots through a portion of a metal tube, cuttin the tube longitudinally to its opposite ends om such cuts and flattening out that portion ofthetube which is cut longitudinally.

2. The process of making brake shoe blanks which consists in making two cross slots through three sides of a rectangular metal tube, cutting the tube longitudinally in opposite directions from the cross slots on the side opposite the unsevered portion of the shoe and flattening out that portion of the tube which is cut longitudinally.

3. The process of making brake shoe blanks which consists in making two cross slots through three sides of a rectangular metal tube, cutting out longitudinal sections from the cross slots to the ends of the tube on the side opposite the nnsevered side of the tube and flattening out. that portion of the tube which is cut longitudinally.

4. The process of making brake shoe blanks which consists in making two cross slots through three sides of a rectangular metal tube cutting out longitudinal sections from the cross slots to the ends of the tube on the side gpposite the unsevered side of the tube, and attening out and leaving corrugated that portion of the tube which is out longitudinally.

5. A brake shoe blank comprising a cen- I .a holding key, and extended end sections formed by flattening the end projections, of the central section.

7. A brake shoe blank comprising a tube with its central portion intact and its endssplit and flattened to support the body of the brake shoe;

In testimony whereof I have hereunto signed my'name in the presence of the two subscribed witnesses.

v HENRY K. GILBERT.

Witnesses: PAUL CARPENTER,

ALBERT GRANT MILLER. 

